Safety lock

ABSTRACT

The invention relates to a safety lock provided with a number of apertures capable of receiving individual workmen&#39;&#39;s padlocks and controlled by a master key so that the workman may work on a machine in the sure knowledge that the power cannot be switched on inadvertently by another workman.

United States Patent Dorey 1 Nov. 28, 1972 [54] SAFETY LOCK [56]References Cited [72] Inventor: Albin E. Dorey, P.O. Box 727, H UNI 1 EPATN 1 S V Esterhazy, Saskatchewan, Canada 1,934,319 11/1933 Newbauer..70/57 [22] Filed: May 20, 1971 pp 145,151 Primary Examiner.loseph H.McGlynn Attorney-Thomas M. Marshall [30] Foreign Application PriorityData May 27, 1970 Canada ..083,839 [57] ABSTRACT The invention reiatesto a safety lock provided with a ..70/38 Eggs/131667.22 number fapertures capable f receiving individual 58 Field of Sea I. 76152-54,337, s padhcks and by a master key 70/339, DIG. 63, 38, 41

that the workman may work on a machine in the sure a knowledge that thepower cannot be switched on inadvertently by another workman.

PATENTED I973 3,703,821

SHEET 1 OF 2 FIG.1

l N VE N TOR A la/1v E. 0025/ PAIENTEnmm I 12 3,703,821

SHEET 2 [IF 2 FIG. 2

INVENTOR AL BIN f. 00RY ATTORNE SAFETY LOCK This invention relates tosafety locks. Machine shops, plants, etc. often require various machinesto be serviced or repaired. Such servicing is accomplished by differenttradesmen, depending upon the type of servicing required, i.e.mechanics, electricians, refrigerating engineers, plumbers, etc.However, it is essential, when such a tradesmen is working on a machine,to ensure that the power is not switched on by somebody else. Forinstance, two different tradesmen, e.g., a mechanic and an electrician,may both be working simultaneously on the same machine. In consequence,lock-out arrangements have been known for some time. I

A lock-out arrangement generally resides in the provision of a so-calledsafety lock, which can be used in conjunction with the power switch tothe machine, and which lock is provided with a number of holes eachcapable of receiving a padlock insertable thereinto and under thecontrol and key of a particular mechanic. With such lock-outarrangements, there has always been the possibility that one of thetradesman will forget to use his padlock whereupon the other tradesmanmay remove his padlock and switch on the machine, thinking that he isthe only person working on the machine.

Hence, it is the object of the present invention to provide a lock-outdevice which will permit the use of individual padlocks by tradesmen andyet which will be under the ultimate control of a supervisor.

Accordingly, the present invention relates to a lockout device includinga lock body; a hasp pivotally and slidably connected to said body andcapable of being retained in locked operative position with said body; afirst wing secured to said body; a secondwing secured to said hasp; andcorresponding apertures formed in said wings adapted to receiveindividual padlocks when said apertures and wings are aligned with oneanother and the hasp is in said operative position.

The invention is illustrated in the accompanying drawings in which:

FIG. 1 is a perspective view of the lock-out device in v an inoperativecondition; and

FIG. 2 is a view similar to FIG[ I but showing the device in anoperative condition.

Referring to the drawing, the lock-out device includes a lock body 1containing a lock (not shown) operable through a keyway (also notshown). The body 1 is provided with a pivotable and longitudinallyslidable elongated U-shaped hasp indicated generally at 2 and, as shownin FIG. 1, one limb 3 of the hasp is capable of being disengaged fromthe usual passageway 4 in which it is normally accommodated when thehasp is in an operative condition.

Welded to one side of the lock body 1, or integral therewith, is a firstlock-out wing 5 provided with an aperture 6 and a plurality of furtherapertures 7.

Welded to the remaining limb 8 of the hasp 2, or integral therewith, isa second lock-out wing 9, the overall length of which is less than theoverall length of first wing 5, and which is provided with a pluralityof apertures 7 (see FIG. 1

In use, the lock-out device normally hangs from the main power switch tothe machine by means of a chain (not shown) passing through aperture 6.When it is desired to lock-out the machine for the purpose ofmaintenance or repair, the operator, shop foreman or superintendentopens the main power switch and places the hasp through the usualholeprovided on such switches and then locks the hasp to the body 1 in knownmanner. Such action enables the two wings 5 and 9 to be aligned with oneanother, as are the apertures 7 and 7 If, say an electrician then wishesto work on the machine, he would place his padlock through a pair ofaligned apertures 7, 7'. If, simultaneously, a plumber wished to work onthe same machine, he would place his own padlock through a pair ofsimilar and aligned apertures 7, 7'.

Each workman is then able to repair the machine knowing that theultimate responsibility of the lock-out resides with the shop foreman oroperator..As each mechanic finishes his particular job, he reports tothe operator, shop foreman or superintendent before removing his padlockfrom the lock-out device. When the final mechanic has reported, thesuperintendent or operator then checks the device to satisfy himselfthat all padlocks have been removed and then unlocks the device with hismaster key thereby permitting said power switch to be moved to itsoperative ON position.

If desired, aperture 6 can be utilized for the hanging of the workmenspadlocks, provided with stamped serial numbers thereon, when not in use.

Although a preferred embodiment of the safety lock of the presentinvention has been described hereinabove and illustrated in thedrawings, modifications and equivalents thereof will be readily apparentto those skilled in the art.

What is claimed is:

1. A lock-out device including a lock body; a hasp pivotally andslidably connected to said body and capable of being retained in lockedoperative positionwith said body; a first wing secured to said body; asecond wing secured to said hasp; and corresponding apertures formed insaid wings adapted to receive individual padlocks when said aperturesand wings are aligned with one another and the hasp is in said operativeposition.

2. A lock-out device according to claim 1 including latch means withinsaid body and cooperating with said hasp to retain the latter in itslocked position, said latch means being controllable by a key.

3. A safety lock-out device comprising:

a lock including a body and a hasp pivotally and slidably connected tosaid body and capable of being retained in locked operative positionwith said body;

a first wing member secured to said body and including at least oneaperture; and

a second wing member secured to said hasp and including at least oneaperture, said apertures being aligned when the hasp is in operativelocked position with said body whereby an individual padlock may bereceived within said aligned apertures thereby preventing the hasp frombeing moved to the unlocked inoperative position with said body.

4. A safety lock out device according to claim 3 including latch meanswithin said body, said latch means cooperating with said hasp to retainthe latter in its locked position, said latch means being controllableby a key.

5. A safety lock-out device as in claim 3 wherein said first and secondwings each include a plurality of apertures.

6. A safety lock-out device as in claim 3 wherein the hasp is U-shaped,with the second wing being con- 5 nected to one leg of said U-shapedhasp.

1. A lock-out device including a lock body; a hasp pivotally andslidably connected to said body and capable of being retained in lockedoperative position with said body; a first wing secured to said body; asecond wing secured to said hasp; and corresponding apertures formed insaid wings adapted to receive individual padlocks when said aperturesand wings are aligned with one another and the hasp is in said operativeposition.
 2. A lock-out device according to claim 1 including latchmeans within said body and cooperating with said hasp to retain thelatter in its locked position, said latch means being controllable by akey.
 3. A safety lock-out device comprising: a lock including a body anda hasp pivotally and slidably connected to said body and capable ofbeing retained in locked operative position with said body; a first wingmember secured to said body and including at least one aperture; and asecond wing member secured to said hasp and including at least oneaperture, said apertures being aligned when the hasp is in operativelocked position with said body whereby an individual padlock may bereceived within said aligned apertures thereby preventing the hasp frombeing moved to the unlocked inoperative position with said body.
 4. Asafety lock-out device according to claim 3 including latch means withinsaid body, said latch means cooperating with said hasp to retain thelatter in its locked position, said latch means being controllable by akey.
 5. A safety lock-out device as in claim 3 wherein said first andsecond wings each include a plurality of apertures.
 6. A safety lock-outdevice as in claim 3 wherein the hasp is U-shaped, with the second wingbeing connected to one leg of said U-shaped hasp.